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We are using this PHP test code to setup a connection to an Emailing system API server (the API link is https://www1.emarsys.net/api/v2/) :
The code is working fine under the development server (check here http://globaltechnosys.com/PHPRESTAPI/examples3.php). We have upload same test code to our production server where this code is needed (check here http://www.group4deal.com/PHPRESTAPI/examples3.php) but this is not working on this site.
Since the test code is working with one server (a go daddy server) but not working with another one (an OVH server based on CentOS 5.3) It seems there is an issue with our production server firewall configuration not letting us to establish the connection towards the API server (https://www1.emarsys.net/api/v2/).
We need a server administrator with good experience with server based on CentOS 5.3 to investigate the matter and fix it. The target is to fix the issue and that is the condition of the project success.